PT - JOURNAL ARTICLE AU - Jeffery R. Williams TI - Social traps and incentives: Implications for low-input, sustainable agriculture DP - 1990 Jan 01 TA - Journal of Soil and Water Conservation PG - 28--30 VI - 45 IP - 1 4099 - http://www.jswconline.org/content/45/1/28.short 4100 - http://www.jswconline.org/content/45/1/28.full